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Article: Age and geochemistry of contrasting peridotite types in the Dabie UHP belt, eastern China: Petrogenetic and geodynamic implications

TitleAge and geochemistry of contrasting peridotite types in the Dabie UHP belt, eastern China: Petrogenetic and geodynamic implications
Authors
KeywordsAge dating
Dabie UHP terrane
Geochemistry
North China mantle wedge
Peridotite PGE
Yangtze Neoproterozoic intrusion
Zircon Hf isotope
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2008, v. 247 n. 1-2, p. 282-304 How to Cite?
Abstract
The Dabie ultrahigh-pressure (UHP) metamorphic belt, central China, contains two contrasting types of ultramafic-mafic complex. The Bixiling peridotite in the southern Dabie terrane contains abundant garnet (21-32 vol.%) and thus has high CaO +Al 2O 3 (9.94-15.3 wt.%). The peridotite also has high REE contents with flat REE patterns, high contents of S and other incompatible trace elements, together with low-Mg # olivine and pyroxene and low Ni and PGE contents. Zircons from this peridotite mostly have low Th/U ratios, interpreted to reflect a metamorphic origin, and give dominantly Triassic ages (ca. 210 Ma). Other zircons with high Th/U ratios give upper intercept ages of 745 Ma. Most zircons have positive e{open} Hf (+- 3.6 ∼ +- 8.1) values with depleted-mantle model ages (T DM) of 0.6-1.0 Ga (mean 0.8 Ga) and crustal model ages (T crust) of 0.8-1.4 Ga (mean 1.1 Ga). We interpret that the Bixiling complex was formed as cumulates in a Neoproterozoic asthenosphere-derived magma chamber in the continental crust, and was later carried to garnet-stable depths (ca. ∼ 4.4 GPa) during the subduction of the Yangtze Craton in the Triassic. In contrast, the Raobazhai peridotite in the northern Dabie terrane was metamorphosed at lower P/T conditions (i.e. 15 Kb and 1000 °C). All zircon grains from the peridotite yield Triassic ages (ca. 212 Ma) and have negative e{open} Hf values (- 16.6 ∼ - 3.2), Mesoproterozoic model ages (T DM = 1.0-1.5 Ga) and Paleoproterozoic crustal model ages (T crust = 1.5-2.3 Ga). The peridotite is enriched in LREE ((La/Yb) n ≈ 3.5), has high-Mg # olivine and pyroxene, high Ni and PGEs but low Pd/Ir (mean 3.0). It represents a highly refractory residue of partial melting (up to 18%) of primitive mantle, and is similar to the cratonic mantle xenoliths in Phanerozoic igneous rocks from the eastern North China Craton (e.g. Mengyin and Hebi areas). Negative Ce, Eu and HFSE anomalies in the peridotites suggest that their protolith was derived from the shallow part of the mantle wedge (e.g. plagioclase-stable field) of the North China Craton, and was pulled to a deeper level (e.g. spinel-stable field) during the subduction of the Yangtze Craton. The mantle wedge, like peridotitic xenoliths in the Jurassic Xinyang diatremes at the southern edge of the North China Craton, was metasomatised by fluids/melts released from the subducted continental crust. The fragments of this modified mantle wedge were incorporated into the Yangtze crust during its subduction. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72578
ISSN
2013 Impact Factor: 3.482
2013 SCImago Journal Rankings: 1.927
ISI Accession Number ID
References

 

Author Affiliations
  1. China University of Geosciences
  2. The University of Hong Kong
  3. Macquarie University
  4. Dalhousie University
DC FieldValueLanguage
dc.contributor.authorZheng, JPen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorGriffin, WLen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZhao, GCen_HK
dc.contributor.authorRobinson, Pen_HK
dc.contributor.authorTang, HYen_HK
dc.contributor.authorZhang, ZHen_HK
dc.date.accessioned2010-09-06T06:43:09Z-
dc.date.available2010-09-06T06:43:09Z-
dc.date.issued2008en_HK
dc.identifier.citationChemical Geology, 2008, v. 247 n. 1-2, p. 282-304en_HK
dc.identifier.issn0009-2541en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72578-
dc.description.abstractThe Dabie ultrahigh-pressure (UHP) metamorphic belt, central China, contains two contrasting types of ultramafic-mafic complex. The Bixiling peridotite in the southern Dabie terrane contains abundant garnet (21-32 vol.%) and thus has high CaO +Al 2O 3 (9.94-15.3 wt.%). The peridotite also has high REE contents with flat REE patterns, high contents of S and other incompatible trace elements, together with low-Mg # olivine and pyroxene and low Ni and PGE contents. Zircons from this peridotite mostly have low Th/U ratios, interpreted to reflect a metamorphic origin, and give dominantly Triassic ages (ca. 210 Ma). Other zircons with high Th/U ratios give upper intercept ages of 745 Ma. Most zircons have positive e{open} Hf (+- 3.6 ∼ +- 8.1) values with depleted-mantle model ages (T DM) of 0.6-1.0 Ga (mean 0.8 Ga) and crustal model ages (T crust) of 0.8-1.4 Ga (mean 1.1 Ga). We interpret that the Bixiling complex was formed as cumulates in a Neoproterozoic asthenosphere-derived magma chamber in the continental crust, and was later carried to garnet-stable depths (ca. ∼ 4.4 GPa) during the subduction of the Yangtze Craton in the Triassic. In contrast, the Raobazhai peridotite in the northern Dabie terrane was metamorphosed at lower P/T conditions (i.e. 15 Kb and 1000 °C). All zircon grains from the peridotite yield Triassic ages (ca. 212 Ma) and have negative e{open} Hf values (- 16.6 ∼ - 3.2), Mesoproterozoic model ages (T DM = 1.0-1.5 Ga) and Paleoproterozoic crustal model ages (T crust = 1.5-2.3 Ga). The peridotite is enriched in LREE ((La/Yb) n ≈ 3.5), has high-Mg # olivine and pyroxene, high Ni and PGEs but low Pd/Ir (mean 3.0). It represents a highly refractory residue of partial melting (up to 18%) of primitive mantle, and is similar to the cratonic mantle xenoliths in Phanerozoic igneous rocks from the eastern North China Craton (e.g. Mengyin and Hebi areas). Negative Ce, Eu and HFSE anomalies in the peridotites suggest that their protolith was derived from the shallow part of the mantle wedge (e.g. plagioclase-stable field) of the North China Craton, and was pulled to a deeper level (e.g. spinel-stable field) during the subduction of the Yangtze Craton. The mantle wedge, like peridotitic xenoliths in the Jurassic Xinyang diatremes at the southern edge of the North China Craton, was metasomatised by fluids/melts released from the subducted continental crust. The fragments of this modified mantle wedge were incorporated into the Yangtze crust during its subduction. © 2007 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeoen_HK
dc.relation.ispartofChemical Geologyen_HK
dc.rightsChemical Geology. Copyright © Elsevier BV.en_HK
dc.subjectAge datingen_HK
dc.subjectDabie UHP terraneen_HK
dc.subjectGeochemistryen_HK
dc.subjectNorth China mantle wedgeen_HK
dc.subjectPeridotite PGEen_HK
dc.subjectYangtze Neoproterozoic intrusionen_HK
dc.subjectZircon Hf isotopeen_HK
dc.titleAge and geochemistry of contrasting peridotite types in the Dabie UHP belt, eastern China: Petrogenetic and geodynamic implicationsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0009-2541&volume=247&spage=282–304&epage=&date=2007&atitle=Age+and+geochemistry+of+contrasting+peridotite+types+in+the+Dabie+UHP+belt,+eastern+China:+Petrogenetic+and+geodynamic+implications.+en_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.emailZhao, GC:gzhao@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.identifier.authorityZhao, GC=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.chemgeo.2007.10.023en_HK
dc.identifier.scopuseid_2-s2.0-37549059571en_HK
dc.identifier.hkuros144279en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-37549059571&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume247en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage282en_HK
dc.identifier.epage304en_HK
dc.identifier.isiWOS:000253114500018-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZheng, JP=25026554400en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridGriffin, WL=35229299300en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZhao, GC=7403296321en_HK
dc.identifier.scopusauthoridRobinson, P=7403720506en_HK
dc.identifier.scopusauthoridTang, HY=8609003600en_HK
dc.identifier.scopusauthoridZhang, ZH=49261323100en_HK

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